645732612 has 36 divisors (see below), whose sum is σ = 1865450496. Its totient is φ = 184494960.

The previous prime is 645732583. The next prime is 645732653. The reversal of 645732612 is 216237546.

645732612 is a `hidden beast` number, since 6 + 4 + 5 + 7 + 32 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1280964 + ... + 1281467.

Almost surely, 2^645732612 is an apocalyptic number.

It is an amenable number.

645732612 is an abundant number, since it is smaller than the sum of its proper divisors (1219717884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645732612 is a wasteful number, since it uses less digits than its factorization.

645732612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562448 (or 2562443 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 645732612 is about 25411.2693897806. The cubic root of 645732612 is about 864.3392604148.

The spelling of 645732612 in words is "six hundred forty-five million, seven hundred thirty-two thousand, six hundred twelve".